Gun Bolt Assembly of Air-Soft Pistol

ABSTRACT

A gun bolt assembly of air-soft pistol is disclosed to include an air cylinder, a slide carriage, a bridge member affixed to an inner rear side of the slide carriage, a piston affixed to the front side of the base of the bridge member and inserted through a rear opening of the air cylinder into the inside of the air cylinder, and a second spring positioned inside the air cylinder and the piston and axially connected between the air cylinder and the piston. Thus, the second spring will not fall off easily or wear quickly, allowing smooth displacement between the air cylinder and the piston without deviation from the accurate moving path.

NOTICE OF COPYRIGHT

A portion of the disclosure of this patent document contains materialwhich is subject to copyright protection. The copyright owner has noobjection to any reproduction by anyone of the patent disclosure, as itappears in the United States Patent and Trademark Office patent files orrecords, but otherwise reserves all copyright rights whatsoever.

BACKGROUND OF THE PRESENT INVENTION

Field of Invention

The present invention relates to gun technology and more particularly,to a gun bolt assembly of air-soft pistol, which greatly enhances thestability of relative movement between the air cylinder and the piston.

Description of Related Arts

Regular toy air-soft pistols are designed like a real pistol. These toyair-soft pistols have the same outer appearance of a real pistol. Theyoperate in the same manner as a real pistol. Further, similar to a realpistol, these toy air-soft pistols produce recoil upon shooting.Enhancing the generation of recoil of a toy gun greatly attracts toy gunplayers.

An air-soft toy pistol utilizes high-pressure gas to drive the gun boltassembly. Traction between the slide carriage and air cylinder of thegun bolt assembly is achieved by a spring member. When high-pressure gasis delivered into the air cylinder to drive a bullet toward the outside,the piston and the slide carriage are simultaneously forced backwards byhigh-pressure gas to produce recoil. At this time, the spring member isstretched out. After interruption of the supply of high-pressure gas,the elastic restoring energy of the spring member pulls the piston back.

FIGS. 1 and 2 illustrate a gun bolt assembly “a” according to the priorart of an air-soft pistol, which comprises a slide carriage 10 and anair cylinder 20. The slide carriage 10 has a bridge member 30 fixedlymounted in a rear side thereof. The bridge member 30 comprises a base301, two rails 302 forwardly extended from two opposite lateral sides ofthe base 301 (see FIG. 1). Further, a piston 40 is affixed to a frontside of the base 301 (see FIG. 2). Further, a screw 401 is insertedthrough the center of a packing member 402 and driven into the frontside of the piston 40 to lock a piston cushion 403 to the front side ofthe piston 40. The air cylinder 20 is a hollow member, comprising an airinlet 201 located at a bottom side thereof, an air outlet 202 located ata front side thereof, and an opening 203 located at an opposing rearside thereof. Further, a wad 204 is mounted inside the air cylinder 20behind the air outlet 202. A first spring 205 is mounted around a frontside of the wad 204 to support the wad 204 inside the air cylinder 20.The piston 40 is inserted through the opening 203 into the inside of theair cylinder 20. Further, two second springs 50 are disposed at a topoutside relatively to the air cylinder 20 and base 301 and connectedbetween the air cylinder 20 and base 301 for enabling the air cylinder20 and the piston 40 to be moved relative to each other within a limitedrange.

Thus, as shown in FIG. 2, when high-pressure gas is fed into the aircylinder 20 to drive a bullet toward the outside, the piston 30 and theslide carriage 10 are forced backwards by a reversed flow ofhigh-pressure gas, thereby producing recoil. At the same time, thesecond spring 50 is forced by high-pressure gas to stretch out (see FIG.3). After interruption of the supply of high-pressure gas, the aircylinder 20 and the piston 40 are pulled back to their former positionby the elastic restoring force of the second spring 50 (see FIG. 4).

However, because the distance between the air cylinder 20 and the slidecarriage 10 is limited, the wire diameter of the second springs 50 mustbe limited, lowering the elastic strength and generation of recoil.Further, these second springs 50 wear quickly with use, shortening thelifespan. Further, because the second springs 50 are connected betweenthe air cylinder 20 and the base 301 at the top outside, they tend tofall off. Further, because the pulling force between the air cylinder 20and the base 301 is produced at the top outside of the air cylinder 20,the moving path of the air cylinder 20 can easily be deviated upwardlyfrom the rails 302, causing the air cylinder 20 unable to push thebullet into the gun barrel accurately. An improvement in this regard isdesired.

SUMMARY OF THE PRESENT INVENTION

The present invention has been accomplished under the circumstances inview. It is one object of the present invention to provide a gun boltassembly for air-soft pistol, which has the second spring axiallyconnected between the air cylinder and the piston to prevent falling offand to prolong lifespan, enabling the air cylinder and the piston to bemoved stably without deviation.

To achieve this and other objects of the present invention, a gun boltassembly of air-soft pistol comprises a slide carriage and an aircylinder. The slide carriage has a bridge member fixedly mounted in arear side thereof. The bridge member comprises a base, two railsforwardly extended from two opposite lateral sides of the base, a pistonfixedly mounted at a front side of the base, a fastening componentfastened to a front side of the piston to lock a piston cushion to thefront side of the piston. The air cylinder comprises an air inletlocated at a bottom side thereof, an air outlet located at a front sidethereof, a wad mounted therein at a rear side relative to the airoutlet, a first spring mounted around a front side of the wad to supportthe wad inside the air cylinder, an opening located at a rear sidethereof for the insertion of the piston into the inside of the aircylinder, and a second spring connected between the air cylinder and theslide carriage for enabling the air cylinder to be moved back and forthalong the two rails within a limited range. The second spring has afront end thereof positioned inside the air cylinder, and a rear endthereof inserted through the fastening component and the piston cushionand connected to an inside part of the piston.

By means of axially connecting the second spring between the aircylinder and the piston, the second spring is prohibited from fallingoff. This second spring mounting arrangement allows the use of a largediameter metal wire material for making the second spring to prolonglifespan. Further, because the second spring is axially connectedbetween the air cylinder and the piston, the air cylinder can be movedalong the two rails stably without deviation.

Preferably, the air cylinder further comprises a locating pintransversely mounted therein. The piston has a plug mounted in a rearside thereof and held in place by the base of said bridge member. Thesecond spring has the front end thereof connected to the locating pin,and the rear end thereof connected to the plug. Further, the pistoncomprises a front part and a rear part. The rear part comprises twoscrew holes longitudinally disposed therein at two opposite lateralsides and affixed to the base of the bridge member by two screw bolts.The fastening component is threaded into the front part to lock thepiston cushion to the front part. The plug is plugged into the rearpart. Further, the rear part is relatively smaller than the front part.The bridge member further comprises two arched constraint flangesprotruded from the front side of the base at different elevations andrespectively abutted against opposing top and bottom sides of the rearpart of said piston.

Preferably, the fastening component comprises a head, a shank backwardlyextended from a rear side of said head, an outer thread spirallyextended around the periphery of the shank, an axial hole axially cutthrough the head and the shank for the passing of the second spring, anda tool groove located on an opposing front side of the head for thepositioning of a hand tool to drive the fastening component into or outof the piston.

Other advantages and features of the present invention will be fullyunderstood by reference to the following specification in conjunctionwith the accompanying drawings, in which like reference signs denotelike components of structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a conventional air-soft pistol,illustrating the arrangement of a gun bolt assembly according to theprior art.

FIG. 2 is a sectional view, in an enlarged scale, of a part of FIG. 1,illustrating an operating status of the gun bolt assembly during firing.

FIG. 3 corresponds to FIG. 2, illustrating an operating status of thegun bolt assembly after firing.

FIG. 4 corresponds to FIG. 3, illustrating the slide carriage returnedto the previous position.

FIG. 5 is an exploded view of an air-soft pistol, illustrating thearrangement of a gun bolt assembly in accordance with the presentinvention.

FIG. 6 is a sectional side view of the air-soft pistol shown in FIG. 5.

FIG. 7 is an exploded view of a part of the gun bolt assembly inaccordance with the present invention.

FIG. 8 is a sectional view, in an enlarged scale, of a part of FIG. 6,illustrating an operating status of the gun bolt assembly during firing.

FIG. 9 corresponds to FIG. 8, illustrating the slide carriage movedbackwards after firing.

FIG. 10 corresponds to FIG. 9, illustrating the slide carriage returnedto the previous position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 5 and 6, a gun bolt assembly A of an air-soft pistolis shown comprising a slide carriage 1 and an air cylinder 2.

The slide carriage 1 has a bottom open side (see FIG. 5), and a bridgemember 3 fixedly mounted on the inside near a rear side thereof. Thebridge member 3 comprises a base 31, two rails 32 forwardly extendedfrom two opposite lateral sides of the base 31, and two archedconstraint flanges 33 located at a front side of the base 31 atdifferent elevations (see FIG. 7 and FIG. 8). Further, a piston 4 isaffixed to the front side of the base 31. The piston 4 comprises a frontpart 41 and a rear part 42. A fastening component 43 is threaded intothe front part 41 to lock a piston cushion 44 to a front side of thefront part 41. A plug 45 is plugged into the rear part 42 of the piston4. Further, two screw holes 421 are longitudinally disposed in the rearpart 42 at two opposite lateral sides. Two screw bolts 46 are forwardlyinserted through the base 31 and respectively threaded into the screwholes 421 to lock the piston 4 to the front side of the base 31,enabling the plug 45 to be stopped against the front side of the base31. Further, the rear part 42 is relatively smaller than the front part41. Further, the two arched constraint flanges 33 are respectivelyabutted against opposing top and bottom sides of the rear part 42.

Further, the fastening component 43 comprises a head 431, a shank 432backwardly extended from a center part of a back side of the head 431,an outer thread 433 spirally extending around the periphery of the shank432 for enabling the shank 432 to be threaded into the front part 41 ofthe piston 4, an axial hole 434 axially cut through the head 431 and theshank 432, and a tool groove (such as keystone groove, crossed groove,etc.) 435 located on an opposing front side of the head 431 for thepositioning of a hand tool (such as screwdriver) to drive the fasteningcomponent 43 into or out of the front part 41 of the piston 4.

The air cylinder 2 is a hollow member, comprising an air outlet 21located at a front side thereof, an opening 22 located at an opposingrear side thereof for the insertion of the piston 4 into the inside ofthe air cylinder 2 to let the piston cushion 44 be slidably abuttedagainst the inside wall of the air cylinder 2, an air inlet 23 locatedat a bottom side thereof, a wad 24 mounted inside the air cylinder 2behind the air outlet 21, a first spring 25 mounted around a front sideof the wad 24 and stopped against the inside wall of the air cylinder 2behind the air outlet 21, a second spring 26 connected between the aircylinder 2 and the piston 4, and a locating pin 27 transversely mountedinside the air cylinder 2 and stopped at a rear side of the wad 24. Thesecond spring 26 has a front end thereof connected to the locating pin27, and an opposing rear end thereof inserted through the axial hole 434of the fastening component 43 and the piston cushion 44 and thenconnected to the plug 45. Further, the wire diameter of the secondspring 26 is relatively larger than the prior art design.

When operating the air-soft pistol to shoot a bullet, hammer 5 is biasedforwards (see FIG. 8), and an air intake device 6 is activated forletting high-pressure gas to go through the air inlet 23 into the insideof the air cylinder 2, driving a bullet 7 toward the outside. At thesame time, the piston 4 and the slide carriage 1 are forced backwards byreversed flow of high-pressure gas to produce recoil (see FIG. 9), andthe second spring 26 is forced by high-pressure gas to stretch out,producing an elastic restoring force for pulling back the piston 4 andthe air cylinder 2 after the shooting of the bullet (see FIG. 10).

As stated above, this invention has the second spring 26 be axiallymounted inside the air cylinder 2 and connected between the air cylinder2 and the piston 4, and therefore, this invention eliminates thedisadvantage of the use of a small wire diameter spring member due tospace limitation as seen in the prior art design, and allows the use ofa large wire diameter spring member for producing heavy recoil. Thearrangement of the second spring 26 prevents falling off and prolongslifespan. Further, because the second spring 26 is axially connectedbetween the air cylinder 2 and the piston 4, the air cylinder 2 can bemoved along the two rails 32 stably without deviation (see FIG. 5),enabling the air cylinder 2 to deliver a bullet 7 into the gun barrel 8(see FIG. 10) smoothly and accurately. Thus, this invention effectivelyimproves the drawbacks of the prior art design.

Although a particular embodiment of this invention has been described indetail for purposes of illustration, various modifications andenhancements may be made without departing from the spirit and scope ofthis invention. Accordingly, this invention is not to be limited exceptas by the appended claims.

What is claimed is:
 1. A gun bolt assembly of air-soft pistol,comprising: a slide carriage having a bridge member fixedly mounted in arear side thereof, said bridge member comprising a base, two railsforwardly extended from two opposite lateral sides of said base, apiston fixedly mounted at a front side of said base, a fasteningcomponent fastened to a front side of said piston to lock a pistoncushion to the front side of said piston; and an air cylinder comprisingan air inlet located at a bottom side thereof, an air outlet located ata front side thereof, a wad mounted therein at a rear side relative tosaid air outlet, a first spring mounted around a front side of said wadto support said wad inside said air cylinder, an opening located at arear side thereof for the insertion of said piston into the inside ofsaid air cylinder, and a second spring connected between said aircylinder and said slide carriage for enabling said air cylinder to bemoved back and forth along said two rails within a limited range;wherein said second spring has a front end thereof positioned insidesaid air cylinder and a rear end thereof inserted through said fasteningcomponent and said piston cushion and connected to an inside part ofsaid piston.
 2. The gun bolt assembly of air-soft pistol as claimed inclaim 1, wherein said air cylinder further comprises a locating pintransversely mounted therein; said piston has a plug mounted in a rearside thereof and held in place by said base of said bridge member; saidsecond spring has the front end thereof connected to said locating pinand the rear end thereof connected to said plug.
 3. The gun boltassembly of air-soft pistol as claimed in claim 2, wherein said pistoncomprises a front part and a rear part, said rear part comprising twoscrew holes longitudinally disposed therein at two opposite lateralsides and affixed to said base of said bridge member by two screw bolts;said fastening component is threaded into said front part to lock saidpiston cushion to said front part; said plug is plugged into said rearpart.
 4. The gun bolt assembly of air-soft pistol as claimed in claim 3,wherein said rear part is relatively smaller than said front part; saidbridge member further comprises two arched constraint flanges protrudedfrom the front side of said base at different elevations andrespectively abutted against opposing top and bottom sides of said rearpart of said piston.
 5. The gun bolt assembly of air-soft pistol asclaimed in claim 4, wherein said fastening component comprises a head, ashank backwardly extended from a rear side of said head, an outer threadspirally extended around the periphery of said shank, an axial holeaxially cut through said head and said shank for the passing of saidsecond spring, and a tool groove located on an opposing front side ofsaid head.